skeleton: makes sure nothing is rendered when cells are present (#9466)

combo/public/templatetags/combo.py

@@ -39,6 +39,8 @@ def placeholder(context, placeholder_name):
             (context.get('render_skeleton') or x.is_relevant(context))]
     if context.get('render_skeleton') and not context['cells']:
         context['skeleton'] = skeleton_text(context, placeholder_name)
+    else:
+        context['skeleton'] = ''
     return context
 
 @register.simple_tag(takes_context=True)